Version: (using KDE 4.2.0) OS: Linux Installed from: SuSE RPMs For "normal" threads, if a new email arrives, the thread is expanded to show the new email. If you mark an email as watched (the first in the thread and no follow-ups yet) and a new email arrives, the thread is not expanded, i.e. the new email not visible.
Confirmed for self compiled kmail from 4.2 branch (checked out today).
*** Bug 229849 has been marked as a duplicate of this bug. ***
Thank you for taking the time to file a bug report. KMail2 was released in 2011, and the entire code base went through significant changes. We are currently in the process of porting to Qt5 and KF5. It is unlikely that these bugs are still valid in KMail2. We welcome you to try out KMail 2 with the KDE 4.14 release and give your feedback.